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A through wall cat flap is a great method to let your pets come and go as they please. Be sure not to install it too high into the wall. This could lead to energy loss and the possibility of burglars breaking into your home. Additionally, if you're planning to sell your home in the near future having an opening in your cavity wall could be an issue for prospective buyers. Glass cat doors are a safer alternative. Easy to install A cat flap that is built into the wall allows your cat to come and go